Preheat oven to 350 degrees. Spray Pam cooking oil in two loaf pans. In a large bowl, beat together the eggs, oil, vanilla, zucchini, bananas, lemon juice and sugar. In a different bowl, mix in the flour, salt, baking powder, baking soda, and cinnamon. Begin incorporating the dry ingredients into the wet. Add 1/4 of the dry ingredients into the wet and mix. When well mixed, add another 1/4th of the ingredients until all have been mixed together. Gently fold in the blueberries. Transfer to the prepared loaf pans. Bake 60 minutes in the preheated oven, or until a knife inserted in the center of a loaf comes out clean. Cool 20 minutes in pans, then turn out onto wire racks to cool completely.