135 books • 31 series
Book #41: Julius Caesar
Book #901: William the Conqueror
Book #901: Queen Elizabeth II
Book #901: Queen Elizabeth I
Book #2: Hydroponics
Book #3: Greenhouse and Raised-Bed Gardening
Book #4: Raised-bed Gardening
Book #5: Hydroponics and Greenhouse Gardening
Book #6: Greenhouse Gardening