American Comparative Literature Association
American Literature Association
American Religion and Literature Society
Asian American Writers Workshop
Association for the Study of Literature and the Environment
Circle for Asian American Literary Studies
MLA: Modern Language Association
Modern Humanities Research Association
PEN (Poets, Playwrights, Essayists, Editors, Novelists)
Science Fiction Research Association
Society for the History of Authorship, Reading and Publishing (SHARP)
Society for the Study of American Women Writers
Digital libraries & archives are great ways to view primary sources or full texts without having to travel anywhere. Listed below are a few digital collections of American literary greats.
Many libraries will at the very least post a collection's finding aid online. To search for these, try typing the author's name followed by "digital papers" or "collection finding aid".
All these websites are primary sources.