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Beetles --- Correspondence --- Entomology --- Field notes --- National Museum of Natural History (U.S.) --- Schwarz, Eugene Amandus, 1844-1927 --- United States Dept. of Agriculture

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Correspondence --- Entomology --- Field notes --- Insects--Arizona --- National Museum of Natural History (U.S.) --- Schwarz, Eugene Amandus, 1844-1925 --- United States Dept. of Agriculture --- Arizona --- New Mexico

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Busck, August, 1870-1944 --- Entomology --- Field notes --- Insects --- National Museum of Natural History (U.S.) --- National Museum of Natural History (U.S.) Dept. of --- Schwarz, Eugene Amandus, 1844-1928 --- Panama

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Barber, Herbert Spencer, 1882-1950 --- Beetles --- Entomology --- Field notes --- Insects --- National Museum of Natural History (U.S.) --- National Museum of Natural History (U.S.) Dept. of --- Schwarz, Eugene Amandus, 1844-1928 --- Guatemala

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Entomology --- Field notes --- Insects--Arizona --- Insects--Texas --- National Museum of Natural History (U.S.) --- National Museum of Natural History (U.S.) Dept. of --- Schwarz, Eugene Amandus, 1844-1924 --- Arizona --- Texas --- Western United States