TY  - BOOK
AU  - Ehrlich, Anne H.
AU  - Ehrlich, Paul R.
TI  - How to know the butterflies
U1  - 595.7 - Insectos 
PY  - 1961///
CY  - 
PB  - Wm. C. Brown, 
KW  - Insectos
KW  - Mariposas
N1  - Incluye: Introduction, figures, abbreviations and conventions, index and pictured-glossary; Life cycle and morphology.-- telling males from females.-- variation.-- classification.-- collecting.-- preservation in fluid.-- genitalic dissections.-- faunal regions and life zone; 1961
ER  -