Proceedings of the Fourth International Agricultural Aviation Congress Kingston (Ont.) Canada 25-29 August 1969The world wide expansion of aerial application in agriculture, forestry and public health is clearly reflected by the increased attendance at our international congresses and by the number and quality of the papers presented. Characteristics Book cover finish Hardcover ( square back binding ) Condition Used very good Number of pages 622 Published date 1969 Languages English Size 16 x 24 x 3 cm Author President : P. H. Southwell Editor International