No.4 - USA Stamps

My missing stamps in this series are...

Authors
4.1 - 1c Washington Irving

4.2 - 2c James F Cooper

4.3 - 3c Ralph W Emerson

4.4 - 5c Louisa M Alcott

4.5 - 10c Samuel L Clemens (Mark Twain)

Composer
4.6 - 10c Ethelbert Nevin

Inventors
4.7 - 1c Eli Whitney

4.8 - 2c Samuel FB Morse

4.9 - 3c Cyrus H McCormick

4.10 - 5c Elias Howe

4.11 - 10c Alexander Graham Bell