Duffield, John W.
- 3-Cut Shelterwood; Adams-Fay Lot (TS IX), P-Hm-4. 1935
- A.C. Cline Correspondence: Duffield, J.W.. 1934-1940
- A.C. Cline Correspondence: Kraemer, J. H.. 1934-1958
- Annual cut 1934-1935, seed-tree cutting, PH III, P-Cd4. 1934
- A Comparison of the Shelterwood and Clearcutting Methods - A Progress Study of Three Cutting Plots on the Harvard Forest. (Tom Swamp IX includes carification experiment 34-2 from active research files). 1934-1941
- Damon's pines, State Line, New Hampshire. 1934
- Duffield and Kraemer study; Adams-Fay Lot (TS IX), 2- and 3- Cut Shelterwood. 1935
- Growth of reproduction; 2-cut shelterwood and clearcut strips; Adams-Fay Lot (TS IX). 1935
- Harvard Forest planting tool. 1934
- Harvard Forest Properties - Prospect Hill IX 1934. 1934
- Pine reproduction, 80' clearcut strip; Adams-Fay Lot (TS IX), Strips. 1935
- Pine reproduction, East-West strip; Adams-Fay Lot (TS IX), Strip Cuttings. 1935-1941
- Red pine plantation, Petersham Town Forest. 1934
- Suggestive list of references for radial growth study. 1935
- Tom Swamp IX Stand map and experimental reproduction cutting operations. 1934
- Type and Reproduction Cutting Map of TS IX 1934. 1934
- Ward Shepard Correspondence: U.S.D.A. Forest Service. 1925-1938
- White pine and hemlock shelterwood reproduction (formerly Exp. 34-3, Active Research files). 1940
- A Year at the Harvard Forest (1934-1935). 1999