Ms. Costello

First World War.com - Prose & Poetry

http://www.firstworldwar.com/poetsandprose

First World War.com - Prose & Poetry

Welcome | First World War Poetry Digital Archive

http://www.oucs.ox.ac.uk/ww1lit/

Welcome | First World War Poetry Digital Archive

Poets.org - Poetry, Poems, Bios & More

http://www.poets.org/index.php

Poets.org - Poetry, Poems, Bios & More

The Stars and Stripes: The American Soldiers' Newspaper of World War I, 1918-1919

http://memory.loc.gov/ammem/sgphtml/sashtml/sashome.html

The Stars and Stripes: The American Soldiers' Newspaper of World War I, 1918-1919

The World War I Document Archive

http://net.lib.byu.edu/~rdh7/wwi/

The World War I Document Archive

America's Historical Newspapers at BPL

http://www.bpl.org/

Boston Public Library

World War One Photos. Photographs & Pictures Of The First World War

http://www.ww1photos.com/

World War One Photos. Photographs & Pictures Of The First World War

GoogleBooks

Google Books has many public domain books. Below are some classic books on World War I poetry.  Google books also has many general books on World War I

Poetry of the people: comprising ... - Google Books

http://books.google.com/books?id=IfUOAQAAIAAJ&printsec=frontcover&dq=World+War+I+poetry&hl=en&ei=QQH9TJXMGIKclgeVooCZBQ&sa=X&oi=book_result&ct=result&resnum=9&ved=0CE8Q6AEwCDge#v=onepage&q&f=false

Poems and Songs of the World War PP 357-388 Poetry of the people: comprising ... - Google Books