"Et Besøg hos Charles Dickens i Sommeren 1857" [Danish title] is number 716 in the Hans Christian Andersen Center's register of Andersen's literary works, i.e. no. 16 in the category travelogue (the range 701 - 800). BFN 802.
"Et Besøg hos Charles Dickens i Sommeren 1857" [Danish title] was first published 2 February 1860, cf. the bibliographic description (in Danish) in : Digterens danske Værker 1822-1875, number in bibliography: 802:
Et Besøg hos Charles Dickens i Sommeren 1857. Af H. C. Andersen.
(Bibliografisk kilde: HCAH)
The work was published later (19 November 1868) as a part of Samlede Skrifter af H. C. Andersen. - Otte og Tyvende Bind [Danish title]. (Number 1029. BFN 975. Category/genre: Collected and miscellaneous writings).