1) The ammonifying efficiency of certain Colorado soils

Author
Sackett, Walter G
Series
Bulletin volume 184
Publisher
Agricultural Experiment Station of the Agricultural College of Colorado
Pub. Date
1912.
Language
English

2) The fixation of nitrogen in some Colorado soils

Author
Headden, William P
Series
Bulletin volume 155
Publisher
Agricultural Experiment Station of the Agricultural College of Colorado
Pub. Date
1910.
Language
English

3) The fixation of nitrogen in some Colorado soils: a further study

Author
Headden, William P
Series
Bulletin volume 178
Publisher
Agricultural Experiment Station of the Agricultural College of Colorado
Pub. Date
1910.
Language
English