- Collins, D. L., D. P. Connola, and L. E. Hagmann. 1942. Pages 130-131. Dutch elm disease. Cornell University Agricultural Experiment Station, Report 54.
- Connola, D. P., D. L. Collins, and L. E. Hagmann. 1947a. Brazil, Departamento de defesa Sanitaria da Agricultura. Broca do cafe (Stephanoderes hampei). Sociedade Rural Brasileira, Sao Paulo. Informacoes Semanaes aos snro. 27(233):12-13.
- Connola, D. P., D. L. Collins, and L. E. Hagmann. 1947b. Log treatments for bark beetle control in connection with the Dutch elm disease. Cornell University Agricultural Experiment Station, Bulletin 841. 43 p.
- Hagmann, L. E. 1946. Feeding habits and related activities of the two elm scolytids, Scolytus multistriatus (Marsham) and Hylurgopinus rufipes (Eichhoff) with reference to the spread of the Dutch elm disease pathogen Ceratostomella ulmi (Schwarz) Buisman. Unpublished thesis, Cornell University, Ithaca, New York. 147 p.
- Ozard, W. E., K. G. Parker, L. E. Hagmann, D. L. Collins, L. V. Tyler, and H. Dietrich. 1948. The association of Hylurgopinus rufipes with the Dutch elm disease pathogen . Journal of Agricultural Research 76:175-183.