A few nice Cargo helicopters images I found:

Mil Mi-26T cargo helicopter

Image by Antarant
The world biggest helicopter.

Mil Mi-26T cargo helicopter

Image by Antarant

Boeing 107 model helicopter loading cargo NHHS Photo

Image by San Diego Air & Space Museum Archives
Catalog #: 13_000292
Type: NHHS Photo
Format: BW Glossy Photo
NHHS #: 2002.007.059
Subject: Boeing 107 model helicopter loading cargo
Title: Boeing 107 model helicopter loading cargo NHHS Photo
Repository: San Diego Air and Space Museum Archive
Location: NHHS Collection Box 1