Vol. 2-4 by Mike Mignola, John Arcudi, Guy Davis.
"This volume collects stories from Hellboy: Box full of evil, Abe Sapien: Drums of the dead, B.P.R.D.: Hollow earth, Dark Horse extra, B.P.R.D.: The soul of Venice, B.P.R.D.: Dark waters, B.P.R.D.: Night train, B.P.R.D.: There's something under my bed, and the B.P.R.D.: Plague of frogs comicbook series, issues #1-#5, published by Dark Horse Comics"--Vol. 1, t.p. verso.
"This volume collects "B.P.R.D.: Born again" from Hellboy premiere edition, "Revival" from MySpace Dark Horse presents, issues #8-#9; and stories from the comic-book series B.P.R.D.: The Dead, issues #1-5; B.P.R.D.: War on Frogs, issues #1-#4; and B.P.R.D.: The Black Flame, issues #1-#6, published by Dark Horse Comics"--Vol. 2, t.p. verso.
"This volume collects stories from the comic-book series B.P.R.D.: The Universal Machine, issues #1-#5; B.P.R.D.: Garden of Souls, issues #1-5; and B.P.R.D.: Killing Ground, issues #1-#5, published by Dark Horse Comics"--Vol. 3, t.p. verso.
"This volume collects stories from the comic-book series B.P.R.D.: The Warning, issues #1-#5; B.P.R.D.: The Black Goddess, issues #1-5; and B.P.R.D.: King of Fear, issues #1-#5, published by Dark Horse Comics"--Vol. 4, t.p. verso.
B.P.R.D. : plague of frogs by Michael Mignola. ISBN 9781595829740. Published by Dark Horse Books in 2011. Publication and catalogue information, links to buy online and reader comments.