TY  - BOOK
AU  - McDougall, W. B.
AU  - Sperry, Omer E.
TI  - Plants of Big Bend National Park
U1  - 581.973 
PY  - 1957/// (c.1951)
CY  - Washington
PB  - Government Printing Office
KW  - Botánica
KW  - E.U.A
ER  -