TY  - BOOK
AU  - Zarn,Mark
AU  - Heller,Thomas
AU  - Collins,Kay
TI  - Wild free-roaming horses: status of present knowledge 
U1  - 599.6655 23
PY  - 1977///
CY  - [Washington]
PB  - U.S. Department of the Interior, Bureau of Land Management
KW  - Wild horses
KW  - Caballos salvajes
N1  - Bibliografía: p. 66-72
ER  -