Just picked up on an interesting schism. ትቤ አክሱም መኑ አንተ & የካም መታሰቢያ, both by Asres Yenesew and printed in 1951. ትቤ is typeset with Ethiopic Wordspace, but not የካም. The difference might be the publishing house, ንግድ ማተሚያ ቤት (አዲስ አበባ) vs አሥመራ በኮከብ ጽባሕ ማተሚያ ቤት. Which tracks with the geographic divide.