FYI Helion Titles Re-issued in four volumes
 

I reached out to Helion & Company about the titles below which look like multi-volume re-issues of previous titles. They confirmed that there is no new content in the titles, just being re-issued in a new format.

Air Battles over the Baltic 1941 Volume 1-4 by Mikhail Timin

Air Battles over Hungary 1944-45 Volume 1-4 by Dmitriy Khazanov

Lend-Lease and Soviet Aviation 1941–1945 Volume 1-4 by Vladimir Kotelnikov

So if you already have the older single volumes save your money!

Re: FYI Helion Titles Re-issued in four volumes
 

Much obliged for the confirmation!

I have the Baltic and Hungary books, and it's a relief that I won't have to investigate/buy the new editions.

Regards,
Leon Venter