| Title | American Species of Crepis Their Interrelationships and Distributions as Affected by Polyploidy and Apomixis. Washington, DC |
| Abbreviation | Amer. Sp. Crepis |
| Authors | G. L. Stebbins: E. B. Babcock |
| Publication Dates | 6 Dec 1938 |
| TL2 | 12.852 |
| Remarks | Published as Carnegie Institution of Washington. Publication no. 504 |
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