Griswold, W Griswold's Railroad Engineers' Pocket Companion for the Field: Comprising Rules for Calculating Deflexion Distances and Angles, Tangential Distances ... Art of Leveling From Preliminary Survey to T
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Griswold's Railroad Engineers' Pocket Companion for the Field: Comprising Rules for Calculating Deflexion Distances and Angles, Tangential Distances ... Art of Leveling From Preliminary Survey to T