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RE: Structural Steel Section Properties

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"I believe the beams are Bethlehem Beams and should have been designated
with a "B" rather than an "I"."

The 1930 AISC Manual also lists Carnegie sections which are similar to the
Bethlehem sections for major axis bending.  The tabulated major axis bending
values appear to be similar or the same for most braced and unbraced
conditions.  The minor axis moment of inertia values are slightly larger
(about 10% for the 12" x 36#) Carnegie sections.  

Paul Crocker