SUMMER READING SALE! Through Friday, June 12, use code PENN-SUMMER26 to save 40% on available titles!

(Please note that the three-volume set of Greater Philadelphia is excluded, although the individual volumes are eligible for the discount.)

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Austin Phelps

Books by the Author

Cover of 'The Variation in the Silicate Content of the Water in Monterey Bay, California, during 1932, 1933, and 1934'

The Variation in the Silicate Content of the Water in Monterey Bay, California, during 1932, 1933, and 1934