Insect Enemies and Allies on the Farm - with Information on Spraying, Fumigation and Varieties of InsectsWilliam T. Skilling · First published 2011Open the Tome
Propagation and Care of Plants - with Information on Various Methods and Tools for Propagating PlantsWilliam T. Skilling · First published 2011Open the Tome
Supplying Soil Needs - with Information on Various Methods of Soil NutritionWilliam T. Skilling · First published 2011Open the Tome
sun, moon and stars astronomy for beginnerswilliam t. skilling and robert s. richardson · First published 1946Open the Tome
Teachers' manual for Tours through the world of scienceWilliam T. Skilling · First published 1934Open the Tome
A course in physical nature study for the elementary schoolWilliam T. Skilling · First published 1913Open the Tome
