Question for consideration with the study of p66 and p75; is there enough histrorical evidence to conclude that the content of the woman taken in adultry was part of the original text. Being that p66 nor p75 do not include it. If you do a version comparison with your earliest Greek manuscripts with NA27 and UBS4, you will find that it is a 100% variant. Metzger is a good source for this. Also check our Waegner in "The Students Guide to Textaul Criticism" also available in Logos.