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The citation is ambiguous. It may mean:

22 Stat. 172 (Chapter 312)

You can view this U.S. Statutes at Large citation at these source(s):

22 Stat. 172

U.S. Statutes at Large

Legisworks

PDF - https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/22/STATUTE-22-Pg172.pdf

We also found 1 parallel citation:

Pub. L. 47-312

U.S. Law

22 Stat. 171 (Chapter 311)

You can view this U.S. Statutes at Large citation at these source(s):

22 Stat. 171

U.S. Statutes at Large

Legisworks

PDF - https://govtrackus.s3.amazonaws.com/legislink/pdf/stat/22/STATUTE-22-Pg171c.pdf

We also found 1 parallel citation:

Pub. L. 47-311

U.S. Law