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18. Project no. 4 -- Dust exposure in armored vehicles. Final report on sub-project no. 4-1 -- Determination of dust-loads and characteristics of dusts encountered in operation of armored vehicles

19. Project no. 3 -- Toxic gases in armored vehicles. Partial report on sub-project no. 3-9 -- Determination of the ventilation requirements for gas-proofing tanks : ventilation requirements for gas-proofing the M-5 tank

20. Project no. 3 -- Toxic gases in armored vehicles. Partial report on sub-project no. 3-9, Determination of the ventilation requirements for gas-proofing tanks : subject: ventilation requirements for gas-proofing tanks of the M-4 series