Delaware Indians

Free to read here, from Project Gutenberg.

The Deerslayer

James Fenimore Cooper, also an audiobook

Religion and ceremonies of the Lenape

M. R. Harrington

History, Manners, and Customs of the Indian Nations Who Once Inhabited Pennsylvania and the Neighbouring States.

John Gottlieb Ernestus Heckewelder

Edgar Huntly; or, Memoirs of a Sleep-Walker

Charles Brockden Brown

The Lenâpé and Their Legends

Daniel G. Brinton

The Lenape Stone; or, The Indian and the Mammoth

Henry C. Mercer

The Trail of the Seneca

James A. Braden

The Daughter of the Chieftain : the Story of an Indian Girl

Edward Sylvester Ellis

The Lenni Lenape, or Delaware Indians

Edwin Robert Walker

Old Ninety-Nine's Cave

Elizabeth H. Gray

Physical anthropology of the Lenape or Delawares, and of the eastern Indians in general

Aleš Hrdlička