50 Knots You Need to Know: Learn 50 knots for sailing, climbing, camping, and moreEbook50 Knots You Need to Know: Learn 50 knots for sailing, climbing, camping, and morebyMarty AllenRating: 0 out of 5 stars0 ratingsSave 50 Knots You Need to Know: Learn 50 knots for sailing, climbing, camping, and more for later