estaban catalogando
Imperfect progressive ellos/ellas/ustedes conjugation of catalogar.

catalogar

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En la década de 1990, mientras se estaban catalogando los cuadernos y bocetos del compositor, varios estudiosos plantearon la posibilidad de que parte de las partituras de la obra perdida podrían haber sobrevivido.
But in the 1990s, when the composer's many notebooks and sketches were being catalogued, scholars first raised the possibility that fragments of the music for the lost symphony might have survived.
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almond