El caso del director del colegio desenmascarado / The Case of the Unmask School Director (Cuatro Amigos Y Medio/4 1/2 Friends)Joachim Friedrich · First published 2005Open the Tome
El caso del misterio de los pepinos/ The Case of the Mystery of the Cucumbers (Cuatro Amigos Y Medio/4 1/2 Friends)Joachim Friedrich · First published 2005Open the Tome
El caso de la misteriosa "epidemia del profesor"Joachim Friedrich · First published 2004Open the Tome
El caso de la profesora desaparecida / The Case of the Missing Teacher (Cuatro Amigos Y Medio/4 1/2 Friends)Joachim Friedrich · First published 2003Open the Tome
4 1/2 FreundeJoachim Friedrich, Regina Kehn · First published 1992 · Latest edition 1994Open the Tome
Museum Boltenianum, sive, Catalogus cimeliorum e tribus regnis naturae quae olim collegerat Joa. Fried. BoltenJoachim Friedrich Bolton · First published 1798Open the Tome
