The editorials in the New York Times are an example of a group that can be fairly easily searched. These political action committees or interest groups often publish newsletters and position papers which may be obtained for the asking, or may sometimes be posted to the organization's page on the web. A subject directory of thousands of these organizations is listed below. Many search modes are available. Search by Author for books by a particular author.
Government reports, hearings, and studies are particularly valuable when available.
That ending series of letters and numbers is the government document location number. Many documents are listed in the online catalog. These will be in the GovDocs microfiche files in the Reference Area. Try several to get various views. The series of booklets called The Reference Shelf sometimes presents topics in this manner.