Sentence:  Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled , That the Secretary of the Interior is hereby authorized and directed to establish and maintain a program of stabilization payments to small domestic producers of lead and zinc ores and concentrates in order to stabilize the mining of lead and zinc by small domestic producers on public , Indian , and other lands as <WSD>provided</WSD> in this Act . 
Meaning of the word marked with <WSD> tags:  determine (what is to happen in certain contingencies), especially by including a proviso condition or stipulation