Whenever any body of agricultural producers, any co-operative association composed of agricultural producers or any co-operative marketing association incorporated under the laws of this State or under the laws of any other state of the United States and licensed to do business in this State (such body of agricultural producers, co-operative association or co-operative marketing association being hereinafter referred to as the association), which is engaged in marketing agricultural products for its members shall prepare and deliver to the register of deeds or to the clerk of the court in any county in which the office of the register of deeds has been abolished a book to be called "the contract book of __________" (naming the association), such book shall thereupon become a public record in the office of such register or such clerk and the register or clerk shall record therein the matters and things authorized by this chapter.