Ann- not sure what is happening... when I click on the thumbnail it brings up a grey box that says PDF with an "open in" or "Open in iBooks" option. If you click on "Open in" it will give several other options to copy to notes, copy to iBooks or copy to iTunes U. I just used the option you apparently can't see to open in iBooks. I am also using safari to open heartlandowners.org
Yeah -mine opens as php option, which has only been happening the last copy of months. I am going to contact Apple