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| The New Wonder Book Cyclopedia of World Knowledge. Philadelphia & Toronto: International Press, 1954. |
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| The World Book Encyclopedia. Chicago: Field Enterprises Educational Corporation, 1971. |
Which group of students looks to be having more fun?
(As an aside, the American Optical Company made the first sunglasses to be worn on the moon! You can see photos of other artifacts from this company at the Optical Heritage Museum in Southbridge, Massachusetts.)
(As an aside, the American Optical Company made the first sunglasses to be worn on the moon! You can see photos of other artifacts from this company at the Optical Heritage Museum in Southbridge, Massachusetts.)
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