Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Curtiss, David Raymond, b. 1878 and Moulton, Elton James, b. 1887",Plane trigonometry : a self-teaching course based on Essentials of trigonometry with applications,,Published for the United States Armed Forces by D.C. Heath,1943,War Department education manual,,,,https://cir.nii.ac.jp/crid/1130282268754297344