National Farm Lines and most of the 105 jobs it provides will be leaving Iowa Falls over the next two 'or three months.Fred Clymer, general manager of the local trucking firm, announced Wednesday that the company will couple a move of its general offices to Denison with a severe cutback in its operations.Clymer said that the change is dictated by economics and indicated that the business has lost money most — if not all — of the time since it started in 1963.IN 1963National Farm Lines located here in late 1963 shortly after the Farmbest pork plant started operation. Both companies are affiliated with Farmland Industries of KansasCity, Mo. The initial purpose of National Farm Lines was to haul Farmbest products to the east and west coasts. Like Farmland Industries and Farmbest, it is a cooperative.The community of Iowa Falls raised $20,-000 through public donations to purchase the 20-acre site for the company north of the city on highways 65 and 20.Clymer told representatives of the Iowa Fails Industrial Development CorporationWednesday that the land and building will be offered for sale and that the $20,000 given through the Development Corporation will be returned to that group.The Development Corporation and Farmland Industries had originally agreed that the money would be returned should