Yuma irrigation project. Miscellaneous papers: Agriculture on Yuma reclamation project, [by] Carl S. Scofield; Effects of cross-pollination on size of seed in maize, [by] G. N. Collins and J. H. Kempton; Experiments on decay of Florida oranges, [by] J. G. Grossenbacher; Wild prototype of cowpea, [by] Charles V. Piper.