721.294 721.295 SZOPA JAN Genetic and environmental conditioning of somatic development of children between the ages of seven and fourteen: results of longitudinal family research /Jan Szopa ; Academy of Physical Education in Cracow.- Kraków : [b.w.], 1992 (Druk: Dział Poligrafii : AWF Kraków). 92 s. : wykr. ; 22 cm