British Women Poets of the Romantic Era: An Anthology (Paula R. Feldman)
The New Negro: An Interpretation (Alain Locke)
Transatlantic Romanticism: An Anthology of British, American, and Canadian Literature, 1767-1867 (Lance Newman, Joel Pace, and Chris Koenig-Woodyard)
Poetry & Short Story Reference Center
Twentieth-Century American Poetry
Twentieth-Century English Poetry
Shakespeare Collection Digital Archive
Cambridge Shakespeare
Internet Shakespeare
Oxford World's Classics
In addition to the specific texts included elsewhere in this guide, there are other texts that you may want to consider that can be found in a variety of archives and repositories, including those linked below:
British Library: Collection Guides: Literary Archives and Manuscripts 1600-present
Digital Bodleian
Digital Newberry
Digital Schomburg
The Folger Shakespeare
Library of Congress Digital Collections
One More Voice
Poetry Foundation
Poets.org
The Pulter Project
Willa Cather Archive