3rd journey to the Netherlands East Indies (Java and Bali)
In as early as May 1906 Nieuwenkamp travelled back again to the East, largely supported by the government funds, the royal family, the National Ethnographic Museum in Leiden, and many other institutes and private individuals. He wanted to go back to Bali and finish his book Bali and Lombok.
After an initial ban on travelling to Bali (a military expedition to Bali was under way, aiming to bring Bali almost entirely under Dutch rule), Governor General Van Heutsz gave Nieuwenkamp permission to travel to Bali with the army and there he witnessed the conquest of southern Bali. He remained in Bali until the spring and then returned to the Netherlands bringing back with him a large number of sketches and drawings. Nieuwenkamp also shipped chests, loaded with the artefacts he had purchased, to the Netherlands separately. These objects now form the heart of a number of Indian collections owned by several large Dutch Ethnology museums.
Nieuwenkamp made lots of drawings. After returning home, he would format/rework his etchings and drawings, most of which were published together with the ones he made in 1904 in Bali and Lombok, (1910) and Wanderings around Bali (Elsevier, 1910).