Kellen was interested in animal attractants at an early age, and through trial and error and trapline experience has developed a vast knowledge. This reference guide covers an extensive list of oils, additives, solvents, glands and bases. Plus Kellen shares his thoughts on formulating lures and baits, and covers the process of balancing smells. The theory of formulation is communicated at a level everyone can understand. Paperback, 56 pages.