Gifts and Exchange
Program established in 1879 as part of the founding legislation of the USGS, requiried 3,000 copies of reports and 500 copies of maps be published for scientific exchanges …and all materials received through exchange become the property of the library (US Code, Title 43, Chapter 2, Section 41-42). As much as 40% of the USGS Library's journal collection has been built through exchanges.