2017.233 CUBA 2017 MNH IMPERFORATED PROOF BLOCK4. UNIVERSIDAD DE ORIENTE.
2017.234 CUBA 2017 MNH IMPERFORATED PROOF BLOCK4. UNIVERSIDAD DE ORIENTE.
2017.24 CUBA 2017 MNH. PROOF IMPERFORATE BLOCK 4. 15c. DIA MEDIO AMBIENTE. RESERVA BIOSFERA SIERRA ROSARIO. JUTIA CONGA.