The single most useful reference book for construction industry designers.
Contains information on a wide variety of building types and anthropomorphic (body size) data that is invaluable when planning a building.
Split into sections for each building type, the book contains detailed information on the size of typical furniture, machinery, access and space requirements as well as some basic design constraints for all manner of items.
If I need to know what size a playing pitch is, how much room to leave around furniture or even which room should be next to which I turn to this.