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#24: Hexagon (medium) PDF

#23: Animals in Space (medium) PDF

#22: For Fledgling Enthusiasts (very easy) PDF

#21: Astronomy III (easy) PDF

#20: Astronaut Trivia (medium) PDF

#19: Astronomy II (easy) PDF

#18: The Apollo Program (medium) PDF

#17: International Space Station (easy) PDF

#16: Canadian Space History (hard) PDF

#15: Women in Space (medium) PDF

#14: Early Astronauts (medium) PDF

#13: Astronomy (easy) PDF

#12: Commercial Space (medium) PDF

#11: Project Upward (hard) PDF

#10: Jack Lousma, STS-3 Commander (medium) PDF

#9: More Firsts in Space (medium) PDF

#8: Firsts In Space (easy) PDF

#7: Nuts and Bolts (medium) PDF

#6: Walter Cronkite and the Space Race (medium) PDF

#5: Space Medicine: Mercury-Apollo (medium) PDF

#4: Nuts and Bolts (easy) PDF

#3: Apollo 11 (medium) PDF

#2 Apollo 11 (easy) PDF

#1: The First In-Flight Fatality (medium) PDF