-21- 



Organische chemie. E. F. Gorup-Besanez . C547 G68 

 Oscillation des quatre grauds glaciers. V. 



Payot 0551.3 P29 



Ott, K: von. Graphic statics 0531.2 Ot8 



Palaeozoic plants. Brit. Mus. Nat. Hist . . . 0507 B77 



Parker, J : H: Gothic architecture 0724.3 P22 



Parkinson, 8. Optics O530 P22 



Payot, V. Oscillation des cuatre grands 



glaciers f 0551.3 P29 



Peabody Mus. of Amer. archae. and ethno. 



Ann. rep., '85-'90 C513.7 P31 



Pearson, J. Tides C525.6 L96 



Pendlebury, 0: Lenses and systems of 



lenses 0535.8 P37 



Pennsylvania, Engrs.' Soc. of West. Pro- 



cee., '92-'93 0620.6 P38 



Pennsylvania, geolog. surv. of. Ann. rap., 



'85-87 0557.48 P381 



Pennsylvania, geolog. surv. of. Final rep. .0557.48 P3811 

 Pennsylvania, second geolog. surv. of. Rep., 



57 vols C557.48 P38 



Perry, J: Steam 0621.1 P42 



Perry, J: Practical mechanics 0531 P42 



Philadelphia, Acad. of Nat. Sci. Procee., 



'85-'93 C506 P53 



Phillips, J: A. Ore deposits C553.1 P54 



Photography. W: de W. Abney 0770 Ab7 



Physical optics. R. T. Glazebrook C535 G46 



Physical processes. B. Stewart and W. W. 



H. Gee C530 St4 



Physiology. T: H: Huxley 0612 H98 



Pirie, G: Rigid dynamics C531.3 P66 



Plane and solid geometry. H : Angel 0513 An4 



Plane astronomy. P. T: Main 0521 M28 



