Text ( visual ) : unmediated China und Asiens maritime Achse im Mittelalter : Konzepte, Wahrnehmungen, offene Fragen / Roderich Ptak. -- Berlin ; Boston : De Gruyter , c2019. -- 61 p. : ill. (some col.), maps ; 24 cm. -- (Das mittelalterliche Jahrtausend ; Bd. 5). -- "De Gruyter Akademie Forschung"--Cover ; Includes bibliographical references (p. [52]-61). -- ISBN 9783110622959 ; (BC16424751) ; https://ci.nii.ac.jp/ncid/BC16424751 Author Heading(s): Ptak, Roderich. -- Classification(s): LCC : HF3838.A783. -- Subject Heading(s): LCSH : Trade routes -- China -- History -- To 1500 ; LCSH : China -- Commerce -- Asia -- History -- To 1500 ; LCSH : Asia -- Commerce -- China -- History -- To 1500