TY  - BOOK
AU  - Vries,Hugo de
AU  - MacDougal,Daniel Trembly
TI  - Species and Varieties, Their Origin by Mutation
AV  - QK 
PY  - 2005///
PB  - Project Gutenberg
KW  - Plants -- Evolution
KW  - Plant hybridization
KW  - Plant mutation
KW  - Evolution (Biology)
KW  - Plants -- Variation
N1  - Public domain in the USA; Electronic text
UR  - http://www.gutenberg.org/ebooks/7234
ER  -