Diagram of the Recording Zones ; the Black Spots THE NESTS AND NURSERIES OF INSECTS. BY PERCY COLLINS. THE PETERS SELF-REGISTERING ELECTRIC TARGET FOR RIFLE RANGES., scientific american, 1907-11-30


Diagram of the Recording Zones ; the Black Spots THE NESTS AND NURSERIES OF INSECTS. BY PERCY COLLINS. THE PETERS SELF-REGISTERING ELECTRIC TARGET FOR RIFLE RANGES., scientific american, 1907-11-30


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