TY  - BOOK
AU  - Nielsen,Kaj Leo
AU  - Vanlonkhuyzen,John H.jtauthor
TI  - Plane & sphrerical trigonometry: a review outline with five-place tables, exercises, examinations and answers 
PY  - 1954///
CY  - New York
PB  - Barnes & Noble
KW  - Trigonometry
N1  - Open access
ER  -