- Author: William A. Weber, Ronald C. Wittmann
- Language: English
- Year: 2012
- Author: W.E. Weber William Edwin Weber
- Language: English, German
- Year: 1930
- Author: William P. Weber (auth.)
- Language: English
- Year: 1983
- Author: William P. Weber George W. Gokel (auth.)
- Language: English
- Year: 1977
- Author: William A. Weber Ronald C. Wittmann
- Language: English
- Year: 1996
Colorado Flora
pdf
- Author: William A. Weber Ronald C. Wittmann
- Language: English
- Year: 1996
- Author: Theodore Dru Alison Cockerell William Alfred Weber
- Language: English
- Year: 2000
- Author: William Alfred Weber Ronald C. Wittmann
- Language: English
- Year: 1996
- Author: William Alfred Weber Ronald C. Wittmann
- Language: English
- Year: 1996
