Volume 1
CollectsB.P.R.D: Hollow Earth #1-3Hellboy: Box Full of Evil #1-2Abe Sapien: Drums of the Dead #1
— Description from Comic Vine community (comicvine.gamespot.com · https://comicvine.gamespot.com/bprd-hollow-earth-and-other-stories/4050-32946/).
