The structure & development of the mosses & ferns (Archegoniatae) / by Douglas Houghton Campbell.

Lectures on the evolution of plants / by Douglas Houghton Campbell.

A university text-book of botany / by Douglas Houghton Campbell.

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Douglas Houghton Campbell

Works from the collections

The structure & development of the mosses & ferns (Archegoniatae) / by Douglas Houghton Campbell.

Lectures on the evolution of plants / by Douglas Houghton Campbell.

A university text-book of botany / by Douglas Houghton Campbell.