  To date, only 69 pulsars have been identified with a detected pulsed radio
emission below 100 MHz. A LOFAR-core LBA census and a dedicated campaign with
the Nan\c{c}ay LOFAR station in stand-alone mode were carried out in the years
2014$-$2017 in order to extend the known population in this frequency range. In
this paper, we aim to extend the sample of known radio pulsars at low
frequencies and to produce a catalogue in the frequency range of 25-80 MHz.
This will allow future studies to probe the local Galactic pulsar population,
in addition to helping explain their emission mechanism, better characterising
the low-frequency turnover in their spectra, and obtaining new information
about the interstellar medium through the study of dispersion, scattering, and
scintillation. We observed 102 pulsars that are known to emit radio pulses
below 200 MHz and with declination above \SI{-30}{\degree}. We used the the Low
Band Antennas (LBA) of the LOw Frequency ARray (LOFAR) international station
FR606 at the Nan\c{c}ay Radio Observatory in stand-alone mode, recording data
between 25-80 MHz. complemented with a few additional candidates. Out of our
sample of 102 pulsars, we detected 64. We confirmed the existence of ten
pulsars detected below 100 MHz by the LOFAR LBA census for the first time
\citep{bilous_lofar_2019} and we added two more pulsars that had never before
been detected in this frequency range. We provided average pulse profiles, DM
values, and mean flux densities (or upper limits in the case of
non-detections). The comparison with previously published results allows us to
identify a hitherto unknown spectral turnover for five pulsars, confirming the
expectation that spectral turnovers are a widespread phenomenon.
