http://www.loc.gov/coll/nucmc/

Have a look at this search engine for one of a kind Manuscripts. Also
look at a search database called Archives USA.

Just as an example i did the OCLC simple search and got the following
entrie amoug many many for the words: "Zacatecas" and "Jalisco."

don't know where this one is but looks very very interesting:

Author: Magallanes, José Yrineo.
Title: Family papers, 1776-1901.
Description: 57 folders.
Notes: Papers of José Yrineo Magallanes and his sons,
Mariano, Francisco and Juan, relating to the sale,
inheritance, or transfer of lands and estates mainly in
Tlaltenango and Jérez, province of Zacatecas, Mexico.
In Spanish.
Subjects: Land tenure -- Mexico -- Zacutecas (Province)
Control No.: ocm25865776

and

Author: Sánchez, Prisciliano, 1783-1826.
Title: Prisciliano Sánchez collection, 1822-1851 (bulk
1825-1827).
Description: 330 leaves.
Found In: Genaro García Collection.
Notes: Forms part of: Genaro García Collection.
Lawyer, businessman, political leader, legislator
and governor. Born 1783 in Ahuacatlán, Nueva Galicia
(present state of Nayarit), died 1826 in Guadalajara,
Jalisco, Mexico. Prisciliano Sánchez received a law degree
in 1810. As a businessman in Compostela, he gained popularity
as a local political leader. In 1822 he was elected deputy to
the first national congress, in 1823 to the first constituent
congress, and in 1824 to the first legislature of the state
of Jalisco. In 1825 Sánchez became the first constitutional
governor of Jalisco. In 1826, while still governor, Sánchez
died of an illness resulting from an injury to his hand.
Printed material, correspondence, financial and
legal documents, reports, notes, and assorted materials
relating to Prisciliano Sánchez' political career, his
death, and his last will and testament. García manuscripts
G422 and G422-1 through G422-6 consist of materials
concerning Sánchez' career in government, including
broadsides, nine booklets and pamphlets, proclamations, notes
about legislative sessions and other matters, a letter book,
and a communication to the provincial military concerning
law, politics, and government in the Mexican state of Jalisco
from 1822 to 1826. G422-7 contains reports on an Indian
rebellion in 1825. G426 comprises Sanchez' will, an inventory
of his belongings, financial documents pertaining to the
disposal of his possessions and payment of expenses, decrees
relating to the mourning of his death, funeral prayers and
eulogies, official letters of condolence, and other official
and legal documents pertaining to his death and will.
García, Genaro, Heirs of; purchase; 1921.
Castañeda, Carlos E. and Jack Autrey Dabbs,
eds., Guide to the Latin American manuscripts in the
University of Texas Library. Cambridge, Mass., Harvard
University Press, 1939.
Also available on microfilm, Benson Latin
American Collection.
Prisciliano Sánchez Collection, 1822-1851,
Benson Latin American Collection, General Libraries,
University of Texas at Austin.
Subjects: Sánchez, Prisciliano, 1783-1826 -- Archives.
Jalisco (Mexico : State) -- History --
1821-1861.
Jalisco (Mexico : State) -- Politics and
government -- 1821-1861.
Other authors: García, Genaro, 1867-1920, collector.
Control No.: ocm31795819

and

Author: Parra, Francisco.
Title: Conquista de la Provincia de Xalisco, nuevo reyno
de Galicia y fundacion de su capital, Guadalaxara. Narracion
poetico-sencilla distribuida en XXXI cantos, 1805-1810.
Description: Originals : 800 p. ; 22 cm.
Copies : partial microfilm reel (400 exposures) :
negative (Rich. 102:4) and positive.
Notes: An epic in 31 cantos of 10 octaves each by a
member of the Dominican Convent of Rosario in Guadalajara,
describing the Spainish conquest of Jalisco and also the
founding and development of Guadalajara, during the period
1530-1547. There are notes following the majority of the
cantos and three appended prose summaries listing
respectively the presidents of the province through 1805, the
bishops of the See to the time of Ruiz de Cabañas, and the
cities and towns of the Intendancy.
Copy of the original Ms. rescued by José
Fernando Ramírez during the 1861 disturbance from the
Dominican library in Mexico City and deposited by him in the
library of the Museo Nacional. A foreword, apparently in the
hand of Ramírez, describes the original and states that two
preliminary pages were lost.
Also available on microfilm.
In Spanish.
Forms part of the Hubert Howe Bancroft
Collection.
Subjects: Guadalajara (Mexico) -- History.
Jalisco (Mexico) -- History.
Poems. rbgenr
Other authors: Ramírez, José Fernando, 1804-1871.
Bancroft, Hubert Howe, 1832-1918. Collection.
CU-BANC

and

Author: Anaya, Juan Pablo, 1785-1850.
Title: Juan Pablo Anaya Papers, 1810-1911.
Description: 8 in.
Found In: Genaro García Collection.
Notes: General and politician. Born 1785 in Lagos,
Jalisco; died 1850 in Mexico City. Veteran of the Mexican War
of Independence; aided the United States against the British
in Carolina. Deputy to the national congress (1821). General
Brigada de los Ejércitos Nacionales (1824). Comandante
General for Chiapas (1828). Brigadier General and General de
División (1832). Ministro de Guerra (January 8-30, 1833) in
the administration of president Gómez Pedraza. Governor of
Tabasco (Nov. 17, 1840-Dec. 6, 1840). Comandante General de
Sinaloa and Sonora (1847). Jefe del Ejército del Ocidente
(1847). Involved with construction of a railroad from Mexico
City to Veracruz (1848). Relieved of command December 27,
1848, and became subject of investigation concerning his
reduction of the customs tax.
Correspondence, printed materials, financial and
legal documents, and literary productions concerning Anaya's
military and political career. Papers of his wife, Mercedes
Jaime de Aguirre, and daughter, Gila Anaya, include
correspondence, financial, and legal documents, mostly
relating to Anaya's military pension. Newspaper clippings
concern the construction of the railroad from Mexico City to
Veracruz.
Forms part of: Genaro García Collection.
García, Genaro, Heirs of, purchase, 1921.
Also available on microfilm, Benson Latin
American Collection.
Castañeda, Carlos E. and Jack Autrey Dabbs,
eds., Guide to the Latin American manuscripts in the
University of Texas Library. Cambridge, Mass., Harvard
University Press, 1939.
Juan Pablo Anaya Papers, 1810-1911, Benson Latin
American Collection, General Libraries, University of Texas
at Austin.
Subjects: Anaya, Juan Pablo, 1785-1850 -- Archives.
García, Genaro, 1867-1920 -- Archives.
Jaime de Aguirre de Anaya, Mercedes, 1807-1886.
Anaya, Gila, 1837-
Mexican War, 1846-1848 -- Sources.
Texas -- History -- To 1846 -- Sources.
Railroads -- Mexico.
Mexico -- History -- 1821-1861 -- Sources.
Mexico -- Politics and government -- 19th century