BibSlavKon: 687 hits for 7 on page 30

The Bibliography of International Congresses of Slavists (1929-2018) was converted from thirteen printed volumes into a database in cooperation with the Slavonic Library in Prague (Slovanská knihovna Praha) and contains 8550 records. Since 2008 the Bibliography appear only in electronic form and will be updated in five-year interval according to the next Congresses of Slavists. The further information can be found here. The overview of the classification can be found: here.

Your search for Volume 7 provides 687 hits
291	Voprosy teorii i metodologii sravniteľnogo izučenija slavjanskich literatur Markov, D. F. - Sravniteľnoje izučenije slavjanskich literatur : materialy konferencii 18-20 maja 1971 goda (1973), 7-38
292	Voprosy teorii i metodologii sravniteľnogo izučenija slavjanskich literatur Markov, D. F. - Slavjanskije literatury (1973), 31-55
293	Romanticism and the Concept of Communication in a Slavonic and a Non-Slavonic Literature Partridge, M. - Renaissance and modern studies (1973), 62-82
294	Slovenský romantizmus v stredoeurópskom literárnom kontexte Rosenbaum, K. - Československé přednášky pro VII. mezinárodní sjezd slavistů ve Varšavě (1973), 37-46
295	Ernest Bryll i teatr romantyczny - kontynuacja, czy deformacja? : (analiza Rzeczy listopadowej) Bieńkowska, D. - Canadian Contributions to the Seventh International Congress of Slavists : Warsaw, August 21-27, 1973 (1973), 99-108
296	Poezija Tjutčeva i tradicija romantizma Bočeva, M. - Slavjanska filologija (1973), 121-134
297	Contenu et limites du romantisme dans le cercle de Stankevič : (idéalisme allemand et problématique russe) Bourmeyster, A. - Communications de la délégation française (1973), 77-89
298	Naissance et développement ďun mythe ou ľOccident en quête de ľâme slave Cadot, M. - Communications de la délégation française (1973), 91-101
299	Osobennosti poľskoj i russkoj romantičeskoj prozy 30–40-ch gg. XIX v. : (k probleme geroja i principov jego izobraženija) Cybenko, Je. Z. - 1973, 50 s.
300	Osobennosti poľskoj i russkoj romantičeskoj prozy 1830–1840-ch godov : (k probleme geroja i principov jego izobraženija) Cybenko, Je.z. - Romantizm v slavjanskich literaturach : sbornik statej : k VII Meždunarodnomu s"jezdu slavistov, Varšava, avgust 1973 g. (1973), 110-153

Bibliography of International Congresses of Slavists (BibSlavKon)