Breaking groundde Donald H. Graves, Jane Hansen, Thomas NewkirkMateriasComposition et exercicesSchreibunterrichtAnglais (Langue)Reading (Elementary)GrundschuleEnglish languageLecture (Enseignement primaire)Composition and exercisesLeseunterricht
PProceedings, 1986 Symposium on Mining, Hydrology, SedimentolProceedings, 1986 Symposium on Mining, Hydrology, Sedimentology, and Reclamation, December 8-11, 19861986