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Scientific American, Vol. 64, No. 24 (1891) (1891)
leaf 8
ng which he cannot do until he In proportion to the traffic, more accidents occur Sprague’s specimen was the common white grub fun- receives the staff by the hand of the engineer from the gus which I have figured and described in the Ame7%- upon single track roads and upon single track sections red… … day. large quantities, © 1891 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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