https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!206117~!0#focus ...
Rev. ed. of a portion of: Classification. Class P, subclasses PJ- PM, Washington, 1935, reprinted 1965. "The additions and changes in Class P, subclasses PJ-PK ... will be cumulated and printed in ...
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