22. Hilton, R. J. Frameworking Fruit Trees. Farmers' Bulletin 136 of the Dominion Department of Agriculture. Available from Dominion Department of Agriculture, Ottawa, Ontario, Canada. (Framework grafting technique is adapted to top-working large seedling nut trees).
23. Snyder, John C. Pollination of Tree Fruits and Nuts. Ext.
Bul. 342. Washington State College, Pullman, Washington.
24. Smith, Gilbert L. Practical Nut Growing. 60 pp. illus. $1.50 from author, Wassaic, N. Y.
Note: In addition to the above publications, the horticultural departments of many state and provincial agricultural experiment stations and agricultural colleges have free circulars or bulletins listing the recommended varieties of fruit and nut trees for their areas. The prospective tree planter is advised to place more reliance on the local recommendations (where available) than on those from distant states where the soils, the climate, and the adapted varieties may be quite different.
The NNGA list of some nurseries which sell hardy, named varieties of nut trees is revised each winter. The secretary, will send copies of the next revision free on request.—J. C. McDaniel, Sec'y., Nashville 3, Tenn.