Who knew that John Appleseed was such a prolific author? Certainly not I! (And if you will forgive the pun, I wonder what the market price is for the one second from the right.)

Update: A thank you goes out to commenter Unicode.

📕
CLOSED BOOK
Unicode: U+1F4D5 (U+D83D U+DCD5), UTF-8: F0 9F 93 95

📗
GREEN BOOK
Unicode: U+1F4D7 (U+D83D U+DCD7), UTF-8: F0 9F 93 97

📘
BLUE BOOK
Unicode: U+1F4D8 (U+D83D U+DCD8), UTF-8: F0 9F 93 98

📙
ORANGE BOOK
Unicode: U+1F4D9 (U+D83D U+DCD9), UTF-8: F0 9F 93 99