I understand that R.M. Ballantyne and G.A. Henty are adventure story writers? In that case, I think I'll pick them up
DelphiClassics just released a G.A. Henty compilation:
http://www.delphiclassics.com/shop/g-a-henty/
edit: I've bought four books at Delphi:
R. M. Ballantyne
Robert E. Howard
Zane Grey
G. A. Henty
They cost just over $12, and qualify for the 15% code MERRYBEE, which may be used if a purchase costs at least $10. The site functions fine, but as one of the Baldur's Gate merchants used to say with a fat Irish accent: "Business is dreadfully slow lately." Finding, carting, buying, and downloading these four books cost me almost 30 minutes. So, add one at a time and be patient