Journal of Hydrology. Vol. 20 No. 2 (1973). 

 - Amsterdam : North-Holland Publishing Company.  [date of publication not identified] 
 - p. 
<br/><br/> It contains of Papers, Book Reviews and Notes on June 1973 in Vol. 20 No. 2. 
<br/><br/>Review : Karst hydrology - a review / H. E. LeGrand and V. T. Stringfield. Research papers : Assessing systematic errors in rainfall - runoff models / A. P. Aitken. Determination of the confidence intervals of the Pearson III law using order statistics / B. Bobee and G. Morin. Water yield, annual peaks and exposure in mountainous terrain / N. Bethlahmy. Conversation equations for nonisothermal flow in porous media / A. Dybbs and S. Schweitzer. On the optimal operation of groundwater basins : a calculus of variations approach / V. V. Palciauskas and P. A. Domenico. Book review.