Liquid nitrogen is a compact and readily transported source of dry nitrogen gas, as it does not require pressurization. Further, its ability to maintain temperatures far below the freezing point of water makes it extremely useful in a wide range of applications, primarily as an open-cycle refrigerant, including:
The height will be the bookcase height minus 30 inches, since that is where the fixed shelf is located. Bookcases 12-18 wide will only have one door, those 24-42 wide will have two doors, and those 48-60 will have four doors. The doors on 6-8 foot bookcases will have double panels since they are very tall.
The average volume length is 180 pages (which including omakes or interstitial pages can mean 165-170 actual chapter pages). 4komas have a slightly different format -- they print in a larger format more similar to US graphic novels, and are around 120-140pgs each.