Tolong jelaskan mengenai Karya terpilih dari Jens Esmark

Kurze Beschreibung einer mineralogischen Reise durch Ungarn, Siebenbürgen und das Bannat ( Freyberg, 1798)

Reise fra Christiania til Trondhjem (1829)

Hestmark, Geir 2012. To discover, yes, but top publish...? Jens Esmark, datolite..and thulite. Norwegian Mining Museum, Publication No. 49: 45-52.

Hestmark, G. 2018. Jens Esmark's mountain glacier traverse 1823 – the key to his discovery of ice ages. Boreas 47: 1-10. https://doi.org./10.1111/bor.12260. ISSN 0300-9483. Open access.

Hestmark, G. 2017. Istidens Oppdager. Jens Esmark, pioneren i Norges fjellverden. En Biografi. Kagge Forlag AS, Oslo.720 s. .