>> you are watching american history tv, all weekend, every weekend on c-span3. to join the conversation, like us on facebook at the span -- c-spanhistory. ♪ >> c-span. for history unfolds daily. , c-span was created by public service and is brought to you today by your cable or satellite provider. >> this weekend on american history tv, we hear intelligence experts this got us of the most notable espionage sites in the nation's capital, including embassies, hotels and even walking paths. here is a preview.

>> how many spies in history had an opportunity to examine a drop site from their home? the case goes back to add one who in 1976n moore, throws a brick over the wall at the soviet embassy on 16th street. wrapped around it is a message tied in a row that says i have information to sell to the u.s. government, -- to the russian government. get her interested, drop money in a package between this on thisand the pole address across from his house. he indeed surveilled the drop side. the security officer at the -- the guards bring the rock to him. he does not see the message and says turn it over to the d.c. police. the police read the message and

call the fbi. the fbi fills the drop. he was a retired nsa officer and ultimately arrested. >> once the entire program f -- 4:25 p.m. eastern. check at our c-span classroom website at c-span.org/classroom. it is full of free teaching resources for classroom members. the improved layout gives teachers easy access to ready to go resources for the classroom, including short current event videos that highlight important events in washington, d.c., constitution clip severing the constitution to life, social studies lesson plans, as well as on this day in history resources, a search function allowing teachers to search and filter by date, person, keyword, topic in great level.

held bellringer's video clips of teacher favorites. short videos paired with vocabulary and discussion questions to make the federal government and politics more accessible to your students. >> i love the bell ringers. i will use them as actual bell ringers. i use them conjunction with an activity where doing that day as more of a wrapup. >> the new website is something that is fabulous. my students use it regularly. it is so easy that they are right now working on clipping thats and making questions they can design can turn to their own bell ringers. >> probably my favorite is the deliberations page. is a perfectly set up, ready to go classroom deliberation, classroom discussion on a variety of topics that are current and relevant today. >> if you're a middle school or high school teacher, join thousands of fellow teachers across the nation as a member of spam classroom. is -- c-span classroom. /classroom.

you can request or american timelines poster, a graphic display of the biographies of all 45 presidents. learn about it at c-span.org/ classroom. recently, american history tv was that the american historical association's annual meeting in denver, colorado. we spoke with professors, authors, and graduate students about their research. this interview is about 20 minutes. >> here to talk about civil war medicine and disabled veterans, sarah handley-cousins, phd candidate at the state university in buffalo. joining us also is ashley-bowen -- ashley bowen-murphy, who just got her phd at brown university. our focus has been the panel you did at the aha on the pbs show "mercy street." let me start with you, ashley.