A36 allowable stress is given in API 650 tables, bur API 650 does not ask you to use WRC 107; it is your choice.
And more "bad news": "Ultimately, the choice of allowable is up to you."
See
http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=showflat&Number=242and you can find others using Search facility.