Gum published his findings in 1955 in a study entitled A study of diffuse southern H-alpha nebulae which presented a catalog, now known as the Gum catalog, of 85 nebulae or nebular complexes.
Catalog numbering systems for single records | gum | chewing gum | Natural gum | Chewing Gum (Annie song) | Chewing Gum | Swamp Gum | Red gum (disambiguation) | Red Gum | natural gum | Gum Nebula | gum arabic | Bowman Gum | Whole Internet User's Guide and Catalog | Whole Earth Catalog | Union Catalog | Union catalog | Postage stamp gum | Online catalog | ''Old Gum Tree at Riddells Creek | National Union Catalog | Kirsten Gum | kauri gum | Gum catalog | Gum bichromate | Gum Base | Gum base | GUM | Does Your Chewing Gum Lose Its Flavour (On the Bedpost Overnight%3F) | Dammar gum |