If you have the information, so add them. As I'm living in Europe I don't know much about US releases. Mango is an interesting label. When CDs came on the market, a numebr of US releases (reggae, Carribean and African music only) were distributed here in Europe with prefixes CCD (for CDs) (I've seen a list where K7s had the prefix MLPS (???). The numbers followed - for records originally released until ca. early 1980s - the UK-Island numbers, but then continued at 9xxx with a continuous numbering independently. I'll search for my old list. Mango in the UK started in 1985 as far as I see - using the Island numbering (e.g. 12": Third World: "Now That We've Found love" released in one mix on the Island label and in another one on a Mango label, later they released new material with prefixes CIDM and numbers from 1000 onwards. 
... There are also 4th&B;'way and Antilles as two more mayor sub labels ...
Thank you for your work, !