Collection of 15 number coded specimens that allows study in the response of specimens to long-wave ultraviolet rays. Specimens approximately 1-1/2" x 1-1/2"
Specimens approximately 1-1/2" x 1-1/2"
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Collection of 15 number coded specimens that allows study in the response of specimens to long-wave ultraviolet rays. Specimens approximately 1-1/2" x 1-1/2"