Robert R Humphrey

2) Arizona range resources: II.Yavapai County :[a study in range condition

Author
Humphrey, Robert R
Series
Bulletin volume 229
Publisher
Agricultural Experiment Station, University of Arizona
Pub. Date
[1950]
Language
English

3) 90 years and 535 miles: vegetation changes along the Mexican border

Author
Humphrey, Robert R
Publisher
University of New Mexico Press
Pub. Date
[1987]
Language
English

4) The boojum and its home

Author
Humphrey, Robert R
Publisher
University of Arizona Press
Pub. Date
[1974]
Language
English

5) Common Arizona range grasses: their description, forage value and management

Author
Humphrey, Robert R
Series
Bulletin volume 243
Publisher
Agricultural Experiment Station, University of Arizona Press
Pub. Date
1952.
Language
English

6) Your range, its management

Author
Humphrey, Robert R
Series
Special report volume no. 2
Publisher
University of Arizona
Pub. Date
1959.
Language
English

7) The desert grassland: a history of vegetational change and an analysis of causes

Author
Humphrey, Robert R
Publisher
University of Arizona Press
Pub. Date
[1968]
Language
English

8) Range ecology

Author
Humphrey, Robert R
Publisher
Ronald Press Co
Pub. Date
[1962]
Language
English

9) Forage production on Arizona ranges, 5: Pima, Pinal and Santa Cruz counties

Author
Humphrey, Robert R
Series
Bulletin volume 302
Publisher
College of Agriculture, University of Arizona
Pub. Date
1960.
Language
English