The Gutenberg Webster's Unabridged Dictionary

Chambers's Twentieth Century Dictionary (part 1 of 4: A-D)

Chambers's Twentieth Century Dictionary (part 2 of 4: E-M)

Chambers's Twentieth Century Dictionary (part 3 of 4: N-R)

Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements)

Preface to a Dictionary of the English Language

The Gutenberg Webster's Unabridged Dictionary: Section A and B