There may be more than one repository that has the exact same record. Some vital records were recorded at the local and state level. Some records may have been microfilmed or digitized and available in repositories other than the one that holds the original record. Those duplicated items may occasionally omit a record or have a blurry image. That’s a time to go back and view the original if possible, but many times the duplicate images are completely readable and usable. Those duplicates may be cheaper or easier to access than the original.
Your source citation should always indicate if you used an image copy or the original–that way you don’t “go back to find the ‘original’ when that was what you used in the first place.
We have corrected the link for “US Land Records on FamilySearch” webinar. More details on our announcement page.
Try a Genealogy Search on GenealogyBank.