- E-bookThe Elements of Botany, For Beginners and For SchoolsAsa Gray
- E-bookThe Elements of Botany For Beginners and For SchoolsAsa Gray
- E-bookThe Elements of Botany, For Beginners and For SchoolsAsa Gray
- E-bookThe Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and TennesseeAsa Gray
- E-bookThe Manual of the Botany of the Northern United StatesAsa Gray
- E-bookDarwiniana; Essays and Reviews Pertaining to DarwinismAsa Gray
- E-bookDarwiniana; Essays and Reviews Pertaining to DarwinismAsa Gray
- E-bookThe Manual of the Botany of the Northern United StatesAsa Gray
- E-bookDarwiniana; Essays and Reviews Pertaining to DarwinismAsa Gray
- E-bookThe Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and TennesseeAsa Gray
- E-bookDarwinianaAsa Gray
- E-bookDarwiniana; Essays and Reviews Pertaining to DarwinismAsa Gray