educational services, namely, teaching courses at the secondary level in the fields of English, namely, grammar, usage and composition, speech, drama, voice, debate, English and American literature, mathematics, namely, algebra, geometry, trigonometry and statistics, science, namely, biology, botany, zoology, agronomy, animal husbandry, environmental studies, chemistry, geology and physics, social studies, namely, history, economics, world geography and world cultures, psychology and philosophy, business arts, namely, typing, accounting, computer science, insurance, banking, finance, and business management, marketing, namely, public relations, business structures, namely, proprietorships, partnerships, corporations and cooperatives, salesmanship and entrepreneuring, industrial arts, namely, mechanical and computer drawing, strength of materials, carpentry, log and trail construction, masonry, sheet metal, earth moving and excavation, printing, plumbing and electrical contracting, athletics, namely, volleyball, aikido, gymnastics, swimming, boating and canoeing, outdoor sports, namely, camping, hiking, bicycling, mountain climbing, alpine and Nordic skiing, tracking, stalking, survival studies and woodcraft, foreign language, namely, Spanish, Native American culture and religion, design, drawing, art appreciation, crafts, sculpture, instrumental music, mind expansion and photography