The citation is ambiguous. It may mean:
Pub. L. 56-191 (Session 1; 31 Stat. 77)
AN ACT temporarily to provide revenues and a civil government for Porto Rico, and for other purposes. April 12, 1900 77
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PDF - https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/31/STATUTE-31-Pg77.pdf
also:
We also found 1 parallel citation:
31 Stat. 77
U.S. Statutes at Large
Pub. L. 56-191 (Session 2; 31 Stat. 746)
AN ACT to provide for the construction of a bridge by the Fargo, Duluth and Northwestern Railroad Company across the Red River of the North at Fargo, North Dakota.' February 1, 1901. r 746
You can view this U.S. Law citation at these source(s):
PDF - https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/31/STATUTE-31-Pg746a.pdf
also:
We also found 1 parallel citation:
31 Stat. 746
U.S. Statutes at Large
