and jeff mauer examines hurricanes harvey impact on the petroleum industry and portland gas prices. also, the founder and ceo of a nonprofit group "girls who code" discusses closing the gender gap in stem fields. join the discussion, on saturday morning at 7 a.m. eastern. >> when you think about a one-day festival, the national book festival, and you have over 100 authors, from children's authors, illustrators, graphic novelists, all of these different authors, over 100,000 people coming in and celebrating books and reading. you cannot have a better time, i think. i am a little prejudiced because i am a librarian, but i have to tell you that any reader or anybody wants to get inspired, the book festival is the perfect place. >> book tv's live all-day coverage begins saturday at 10 a.m. with featured authors including david mccullough and thomas friedman, former secretary of state condoleezza rice, and best-selling authors michael lewis and jd van. the national book festival, lives starting at 10:00 a.m. saturday eastern on c-span2's book tv. announcer: president trump met with the l