Gilbert Paper's physical plant on Ahnaip Street, ca. 1958.
We've talked at length about Gilbert Paper Company on this blog, to include this post:
http://menashabook.blogspot.com/2012/07/gilbert-paper-company.html where there's a lot of good back and forth commentary. In that post, the readers were quite informative about some of the products Gilbert produced, to include special papers for currency and Social Security Cards. You should check it out.