Unfortunately, there is no one source for opinions and orders issued by federal administrative agencies, tribunals, and other entities. The University of Virginia has a very good guide to finding federal administrative decisions (URL: http://www.library.virginia.edu/research/), which lists each federal administrative agency and provides links to many of each agency's documents.
You should also visit the website for the specific entity relevant to your research and look for "rulings," "decisions," "orders," "opinions" and similar terms. Some agencies have very robust collections of these documents, and others make few, if any, available.
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