I have question perhaps someone or the moderator can answer. If I search the card catalog for "US Directories" (I was specifically looking for Phila directories), US Directories pops up and has a limited number of years for PHila. Somehow I stumbled upon the US Directories (Beta) which has almost all years. What is the difference and why doesn't the Beta versoin pop up when you search the card catalog for "US Directories". I am wondering if the same holds true of other cities.