Comic Book Catacombs features a page from Alter Ego Magazine (issue 78), that was originally to be included in Giant-Size X-Men #2. That book was cancelled when Marvel decided to publish the story in the ongoing series starting with X-Men #94. According to the site:
"Apparently when plans for "Giant-Size X-Men #2" were originally scrapped in favor of continuing with new material in their own title (which had become a reprint-only series), the planned content was divided into issues #94 and #95 of the regular, bi-monthly X-Men series, and this excellent page simply got cut. Just look at those lush, full pencils and you too will salivate at the incredible talent that Cockrum brought to his 1970's efforts."