Coleccion de laminas que representan los animales y monstruos del real gabinete de historia natural de Madrid, con una descripcion individual de cada uno. Por Don Juan Bautista Bru de Ramon. Tomo 1. [-2.], Madrid, 1784
Juan Bautista Bru de Ramon, painter and royal "copyist" at the Natural History Cabinet of Madrid (1771-1799), produced many drawings of the various specimens stored at the Cabinet, including the skeleton of a Megatherium, the first fossil of an animal ever reconstructed in Europe. He also collaborated with Antonio Sañez at his historical Diccionario historico de los artes de la pesca nacional (1791-1795).