The Lansing book is at https://bookshop.org/p/books/endurance/7205642 or https://tertulia.com/book/9780465062881 or https://www.abebooks.com/servlet/SearchResults?an=Lansing&tn... and information about this 1959 book (by a journalist) is at https://en.wikipedia.org/wiki/Endurance:_Shackleton%27s_Incr...