1. [Landsat 4/5 TM 30m 7-4-2 GeoCover 1990 (1988-1992) near-worldwide and worldwide satellite imagery], Map Series Index Datasets Harvard University Public content 1990. Harvard Map Collection and Land Info (Firm). This polygon is an index to maps of the world, titled [Landsat 4/5 TM 30m 7-4-2 GeoCover 1990 (1988-1992) near-worldwide and worldwide satellite im... Harvard Map Collection.