I've scanned three pertinent customer reviews and present them as scans.
The first is from James Kack, the President/Owner of Holubar during its boom years of the early 1970s. He lived and worked in Boulder, Colorado and had many dealings with two of the other major outdoor companies in town: Frostline and GERRY.



THE BOOKS: MY FIRST BOOK IN A SERIES ABOUT THE HISTORY OF GEAR WAS ABOUT FROSTLINE KITS. PLEASE VISIT MY FROSTLINE PAGE FOR A LINK TO ORDER IT, IN EITHER SOFT-BOUND OR HARD BOUND EDITIONS... The second book was released May 20, 2008 and is titled, "GERRY, To Live in the Mountains" (click on GERRY link below). The third book of the series covers the story of Holubar and was recently honored as one of the year's best "Local History" books at Chautauqua in Boulder, Colorado.... All three books feature major contributions from their founders or their Presidents.