TY  - BOOK
AU  - Hertwig,Oscar
AU  - Mitchell,P.Chalmers
TI  - The Biological Problem of To-day: Preformation Or Epigenesis? The Basis of a Theory of Organic Development
PY  - 2011///
PB  - Project Gutenberg
N1  - Public domain in the USA; Electronic text
UR  - http://www.gutenberg.org/ebooks/37221
ER  -