https://bcl.wikipedia.org/wiki/Horizontal_top-bar_hive?action=edit&redlink=1
Ginigibo an Horizontal top-bar hive - Wikipedia
top bar hivehorizontalwikipedia
https://cheguebeeapiary.blogspot.com/2012/12/the-drum-top-bar-hive-got-twin.html
Che Guebee Apiary: The Drum Top Bar Hive got a Twin
"A blog about natural beekeeping in top bar hives."
top bar hivethe drumcheapiary