Census Links is a growing catalog of links to transcriptions of census, tax lists, birth, death, marriage and military records, all freely available to help with your genealogy research.
From the Zavala County, Texas GenWeb
1870 census of Zavala Co., TX
1880 census of Zavala Co., Texas
1880 census index for Zavala Co., Texas
Scanned images from the UsGenWeb Census Images Project
1870 Mortality Schedule, Zavala County, Texas