One of the notable travellers in Southeast Asia was the ethnologist (Philipp Wilhelm) Adolf Bastian (1826 - 1905), who travelled Burma, the Malay Archipelago (nowadays Malaysia and Indonesia), Siam, Cambodia and Vietnam in the years 1861 - 1865. Adolf Bastian wrote tons of records and published eighty books and more than 300 articles alltogether. His writings go very much in details. So far they concern Southeast Asia they are listed in the literature index.
Adolf Bastian is considered to be the first German ethnologist / anthropologist. He (co-)founded several scientific institutions, among them the 'Königliche Museum für Völkerkunde' ('Museum of Folkart', nowadays Ethnologisches Museum) in Berlin. Many pieces of his huge collection of ethnic artefacts from all over the world were displaced there.