In the 1950s

Approach (April 1954) - Airfields in the vicinity: Llandwrog, Mona (Source: US DoD)

Airfield (April 1954) - There are three runways - 14/32: length 1829 m, width 46 m (6000 feet x 150 feet), 02/20: length 1632 m, width 46 m (5355 feet x 150 feet), 08/26: length 1280 m, width 46 m (4200 feet x 150 feet). Remarkable is a curved section of approach lights to runway 08 on Holy Island west of the airfield (Source: US DoD)
In the 1990s

RAF Valley on a map of the US Department of Defense from 1993 (Source: ONC E-2 (1993), Perry-Castañeda Library Map Collection, University of Texas at Austin)
Source for all maps, if not marked otherwise: US Department of Defense (US DoD)