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![](./images/clear.gif) 1.- Graptolites and trilobites from the Eusebio Ayala Formation (Hirnantian?-early Llandovery), Parana Basin, eastern Paraguay
Wiley; Chichester; GBR; United Kingdom, 2013
Lower Palaeozoic fossils, biostratigraphy and events from western Gondwana
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![](./images/clear.gif) 2.- SILURIAN (LLANDOVERY) MONOGRAPTIDS FROM THE VARGAS PEÑA FORMATION (PARANA BASIN, EASTERN PARAGUAY)
2008
LOWER PALEOZOIC BIOSTRATIGRAPHY OF SOUTH AMERICA: NEW CONTRIBUTIONS AND ADVANCES
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![](./images/clear.gif) 3.- THE HIRNANTIAN-EARLY LLANDOVERY TRANSITION SEQUENCE IN THE PARANA BASIN, EASTERN PARAGUAY
INSTITUTO GEOLOGICO DE ESPAÑA; MADRID; ESP, 2011
ORDOVICIAN OF THE WORLS
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![](./images/clear.gif) 4.- TRILOBITES FROM THE VARGAS PEÑA FORMATION (LLANDOVERY) OF ITAUGUA, EASTERN PARAGUAY
INSTITUTO GEOLOGICO Y MINERO DE ESPAÑA;MADRID;ESP, 2008
ADVANCES IN TRILOBITES RESEARCH: FOURTH INTERNATIONAL TRILOBITE CONFERENCE, TOLEDO, JUNE, 16-14, 2008
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