If put in sequential order with the other B.P.R.D. minis and one-shots, the three issues of this miniseries would be #1-3, preceding B.P.R.D.: The Soul of Venice.
Collected EditionsB.P.R.D.: Hollow Earth and Other Stories TPBB.P.R.D.: Plague of Frogs #1 - Vol. 1 HC
— Description from Comic Vine community (comicvine.gamespot.com · https://comicvine.gamespot.com/bprd-hollow-earth/4050-18285/).
