John F. Kennedy | Pope John Paul II | Elton John | John | John Lennon | John Wayne | John McCain | Robert Louis Stevenson | John Kerry | John Cage | Robert De Niro | Olivia Newton-John | John Williams | Robert E. Lee | John Peel | John Adams | John Steinbeck | John Travolta | John Milton | John Zorn | Robert Mugabe | John Marshall | John Howard | Robert Redford | John Singer Sargent | Robert Burns | Robert Bosch GmbH | John Ruskin | Robert | Robert A. Heinlein |
Boker was able to put together some of the finest collections of rare postage stamps ever seen in philately, with his German States collection probably being his finest.
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John Boker also accumulated large collections of Australian States, State of Buenos Aires, Confederate States of America, Fernando Po, Ionian Islands, Réunion, Romania, Serbia, and the Spanish Philippines.