C514 The Library Was Full of Skills and There Were Some Unconventional Ones(2)

[Secrets of the Sky: Aircraft Research +1] All aircraft production speeds increased by 10%.

[Steel Behemoth: Tank Knowledge +1] All tank production speeds increased by 10%.

[Barrage of Fire: Artillery Knowledge +1] All artillery production speeds increased by 10%.

[Leviathan of the Seas: Nautical Knowledge +1] All ship production speeds increased by 10%