Hello and thank you for contacting us. This is Dwayne B. and I’m an expert here and looking forward to assisting you today. If at any point any of my answers aren’t clear please don’t hesitate to ask for clarification. Also, I can only answer the questions you specifically ask and based on the facts that you give so please be sure that you ask the questions you want to ask and provide all necessary facts.
The US Statutes at Large is a generic name for every statute, law, code, treaty, or ordinance of any type enacted by Congress since its inception.
Unfortunately, there is no law with the designation chap 48, 48 Stat#112.
I recognize the argument you are using and, leaving aside whether I agree or disagree with it, I think what you are looking for is Joint Resolution 192, 48 Stat. 112. That is the law passed bu Congress in 1933 which abrogated the Gold Standard and formally required that obligations of the United States would be exchanged by the Department of the Treasury by gold or silver coins of the same denomination, and replaced it with the current standard which provides that obligations "shall be discharged upon payment, dollar for dollar, in any coin or currency which at time of payment is legal tender for public and private debts."
The law, which was affirmed as constitutional by the U.S. Supreme Court in Norman v. Baltimore & O. R. Co., 294 U.S. 240 (U.S. 1935), effectively permits U.S. currency to "float" with the exchange rates of other nations, because the currency is valued whatever someone is willing to pay for it, either in other currency or in goods or service.
You can read what that law says at https://en.wikisource.org/wiki/Gold_Repeal_Joint_Resolution
I don't know of an online source to the actual law.