51. A row of propeller-driven aircraft with a group of men checking the engine of one Date: unknown Format: Still image Access: Public
52. Some men around a large propeller-driven aircraft next to a row of smaller ones Date: unknown Format: Still image Access: Public
53. Three men around a tractor with an airplane and hangar in the background Date: unknown Format: Still image Access: Public
54. Two men by a large propeller-driven aircraft with smaller ones behind it Date: unknown Format: Still image Access: Public
56. Two men is suits by propeller-driven aircraft Creator: Harris, Frank. Date: unknown Format: Still image Access: Public
57. Two men looking at a large airplane propeller's engine Date: unknown Format: Still image Access: Public