North polar distances of the sun ... computed for the 20th meridian east of Greenwich ... - Philippines (Commonwealth) Dept. of agriculture and commerce; Philippines. Bureau of lands (Manila s.n.)
1926- issued as Philippine islands. Bureau of lands, Bulletin no. 9, 11, 15, 17 as Philippines (Commonwealth) Dept. of agriculture and commerece, Technical bulletin, no. 9, 12, 5
Keywords: Sun -- Tables