tie specifications 1940s

From: "Rob Kirkham" <rdkirkham@xxxxxxx>
To: <cpsig@xxxxxxxxxxxxxxx>
Date: Thu, 29 Sep 2011 19:51:54 -0700

Hi all, I'm trying to find CPR specifications for length and spacing of ties -
applicable during the 20's through 40's. Anyone know?

Rob Kirkham

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