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Number:
6878
Author:
T.C. Simmons
Issue:
ET Vol 34, Oct 1881
Tags:
Optics
Solved by:
D. Biddle, MQ Vol 41
Solved by:
A.H. Curtis, MQ Vol 39
Solved by:
Belle Easton, MQ Vol 41
Solved by:
E. Rutter, MQ Vol 39